Display screen of an engine control system with a graphical user interface



The FIGURE is a front view illustrating our design for a display screen of an engine control system with a graphical user interface.

The broken lines in the FIGURE show portions of the display screen of an engine control system with a graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen of an engine control system with a graphical user interface, as shown and described. 